Unless you've hired someone you haven't told us about, you getting hit by a bus kills tarsnap. Nothing really runs itself on a day-to-day basis without any oversight:
* You still have to invoice/bill customers and do the books.
* You still have to keep up to date with Amazon web services, which could change out from under you.
* You still have to be responsive to bugs in your software, which will inevitably occur.
I take your point though; you've architected the business so that it depends very minimally on your own infrastructure and labor, and so its operational costs are very low.
You still have to invoice/bill customers and do the books.
Actually, no. That's all done automatically.
You're right about the rest -- but so far "bugs in my code" is very correlated to "new features in my code", so if I get hit by a bus it's unlikely that many new bugs will be found.
Well, but your hosting is probably paid for by an account owned by you or your business, and if you go away, those accounts do too, Amazon pulls the plug, Tarsnap go bye-bye.
* You still have to invoice/bill customers and do the books.
* You still have to keep up to date with Amazon web services, which could change out from under you.
* You still have to be responsive to bugs in your software, which will inevitably occur.
I take your point though; you've architected the business so that it depends very minimally on your own infrastructure and labor, and so its operational costs are very low.